Abstract: Methods, systems and apparatuses for creating and aggregating analytical data on advertisement spaces, searching for advertisement spaces that meet specific analytical criteria, and pricing and trading such advertisement spaces in an open and transparent way are described. Analytical information including tags, demographic distributions, geographic traffic statistics, ratings and reviews are compiled and categorized for each advertisement space. A user interface allows users to combine one or more queries to find advertisement spaces that meet their own needs. The user interface displays the results in thumbnail lists, tag clouds, tables or structured formats. Finally, when an advertisement space has been chosen, the trading system creates a stock market metaphor for buying and selling “Rights to advertise” on such advertisement spaces.